[Melbourne-pm] Monitoring Starman apps

Toby Corkindale toby.corkindale at strategicdata.com.au
Wed Mar 14 19:26:01 PDT 2012

On 15/03/12 13:00, Matt Sharpe wrote:
> I was talking to Miyagawa about this and he mentioned
> Plack::Middleware::ServerStatus(::Lite); it does essentially what
> Apache's mod_status does and returns info on workers and active
> requests. Maybe something to look at? The Lite edition should do what
> you want if I understood your initial post correctly…

That looks like what I'm after!

It doesn't take into account io wait and keepalive sessions, 
unfortunately, but as long as there's a reverse proxy in front, those 
shouldn't be occurring, I think.


> On 15 March 2012 07:33, Toby Corkindale
> <toby.corkindale at strategicdata.com.au
> <mailto:toby.corkindale at strategicdata.com.au>> wrote:
>     On 14/03/12 18:14, Andrew McN wrote:
>         Measure the number of open sockets perhaps? Some limitation die to
>         keep-Alive sockets.
>         Sockets are probably better than looking at process states, but
>         that's
>         also possible.
>     I considered this, but there are many states sockets can be in, and
>     not all of them indicate that a process is held open for them.
>     (ie. There are pending open and pending close states which are
>     handled in the kernel)
>     I have also considered using an IPC semaphore flag, which you can
>     atomically increment or decrement from any process, so you could put
>     increments and decrements in appropriate parts of your code..
>     but I was really hoping that someone else had already created all of
>     this! Surely monitoring the number of active Starman processes is an
>     important metric for anyone using it in production?
>     -Toby
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